Malicious PDF — malware analysis report

Static analysis result for SHA-256 076579d3161fa225…

MALICIOUS

PDF

128.8 KB Created: 2021-06-20 14:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9d3644f07fe64c489df5a3c0be2f9b6b SHA-1: 80350faeefb7fc1c8199fd325581d131641cd278 SHA-256: 076579d3161fa225fef96d049976426b636bebc4259ddcaf070ddb173c6be321
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078b0785c70d---lolalularijiwupobujokanil.pdf In PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a069e967c7---58276397510.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/sozujujagopudabix.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6bf98fad---48082905779.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/bdcd1c29d70a3192e69c6421179320ad/56956393604.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ee1ba808a---wadidanajogutamitimap.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f62a9c926bd5c015329a1ac0f5d2ac46/12728600574.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99687a35f---96200551924.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/4heg715vad99204uevu92f1s2l/nekimurokegikusok.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16094553172e6c---20462982458.pdfIn PDF document text
    • https://people11people.gr/uploads/File/47767257666.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/luvro8vmpdtda4j59p4nsa1hka/gogobawofobeluzu.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/a2e1cf04adf5035057b4e423a89efb84/jajiwizabekutimik.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/f38cf3adace6786bffcd26671bf30999/padugepul.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c42e06b987a1540503790251db67a180/gukatus.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cd11641b4---jamipabumako.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/2dd04bdaf11ceb15dd9a962f78060375/ruxal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=panchatantra+story+in+english+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19294 5520 bytes
SHA-256: 82d8dae341858414d30da07f55031d6b83c42af314bdbd6a2a106c7a286a66bd
font_01_sfnt_off0001a55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A55F 15612 bytes
SHA-256: 42290819cb7ed7c855095054f6648f111e2865f2919d27aca6421ba8b23c99a8
font_02_sfnt_off0001d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1F7 16848 bytes
SHA-256: a07b9deeeff1855a68deff3e33a8ad3eefe96aaf953fae9c6f240dc6de49f4a7
font_03_sfnt_off0001ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA0B 2828 bytes
SHA-256: c0c70b612e629c2d89f58621c66dfe320686699b2d6f1ef294b7357f85e98a0c

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